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MILERR_QPC_TIME_WENT_BACKWARD
MILERR_QPC_TIME_WENT_BACKWARD is a Windows Media Integration Layer (MIL) HRESULT. It indicates that the high-resolution timing value used by MIL moved backward, making timing-based rendering calculations unreliable.
Diagnostic discriminator: Capture consecutive QPC values together with CPU, virtualization, firmware, and power context. A negative delta reproduced before rendering work begins is a timing-source anomaly, not a shader or geometry failure.
What to check for MILERR_QPC_TIME_WENT_BACKWARD
- Record CPU, power-management, virtualization, and timing context when the anomaly occurs.
- Avoid assuming that elapsed time is always positive without guarding timing calculations.
- Check system firmware and virtualization settings if the error repeats on the same machine.
Microsoft documentation about WPF hardware-accelerated rendering
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